Arduino tehNiq: Arduino alarm system with delay (2)

In this article I put a keyboard for activate and deactivate a alarms system with Arduino board and PIR sensor.

My schematic is:

My alarm work in next steps:

- after power on, alarm is OFF, blue led is on

- after you introduce the code (1234* or better #1234* because # clear buffer for old activity) system go to stand-by state, green led is blinking;

- after 20 seconds, system is in waitting (watching) mode, green led is permanent on;

- if PIR sensor detect movement, system begin to countdown, red led flash;

- if you indroduce code, system will be off (blue led in on)

- after 10 seconds (if you not enter the code) buzzer is on (led onboard is on), red led is permanet on

- after 10 seconds, system go to waitting mode, if is movement again, countdown and after buzzer is on, etc;

You can see 2 movies with states of this alarm system:

Arduino tehNiq